Over the next few months, Microsoft is removing support for the following versions of Windows and Windows Service Packs:
Windows 2000 Professional and Windows 2000 Server will both go out of support on 13th July 2010.
Windows XP with Service Pack 2 will also go out of support on 13th July. If you wish to keep running Windows XP in a supported mode from that date, you must make sure that you have Service Pack 3 installed.
Windows Vista with no service packs installed will no longer be supported from 13th April. It’s time to install Service Pack 2.
For more information, check out the Microsoft Support Lifecycle Blog.